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Pompeo, R-Kan., said he was "deeply troubled" by the scheduled video appearance of Snowden, whom he described as lacking the credentials to authoritatively speak on issues pertaining to "privacy, surveillance, and online monitoring."

Snowden is scheduled to speak by video conferencing on Monday at 11 a.m. CT with Christopher Soghoian, a privacy advocate and principal technologist at the American Civil Liberties Union, who will be onstage at SXSW in Austin, Texas. Moderated by Ben Wizner, the director of the ACLU's Speech, Privacy, and Technology Project, Snowden is expected to answer audience questions.

Snowden's "only apparent qualification," Pompeo wrote, "is his willingness to steal from his own government and then flee to that beacon of First Amendment freedoms, the Russia of Vladimir Putin."

Representing Kansas' fourth district, Pompeo has been critical of Snowden's whistle-blowing. He described Snowden as a "traitor" in the press release announcing the SXSW letter, and said that the documents leaked by Snowden are "now in the hands of other countries."